package com.imau.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

@WebFilter("/*")
public class FilterDemo implements Filter {
    /**启动项目时自动执行*/
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("过滤器初始化");


    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        System.out.println("放行前的拦截....");
        //放行
        filterChain.doFilter(servletRequest,servletResponse);

        System.out.println("响应前的拦截....");
    }

    @Override
    public void destroy() {

        System.out.println("过滤器销毁");

    }
}
